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Forgot about that. Dragon Tail and Circle Throw would also work. Best bet would be switching in with a Dark type with a phazing move, forcing him to Miracle Eye, giving you that turn you need to force it out.
Toxic or Whirlwind/Roar, probably. Toxic will either kill it with increasing damage if it tries to stay in, or force it to switch out to reset the Toxic damage and lose its stat increases. Either works. Whirlwind/Roar is a more direct way of eliminating those stat increases.